Before commenting about the noise or wax read : the threads were already waxed. plans for the twin screw vise can be purchased here (small fee supports me):. I wanted to add a leg vise to my work bench but didnt want to spend $300+ on it, so i built one out of scrap wood and a scaffold leveling screw, cost me around $25 for the whole project.. Bench screw, vise screw, woodworking bench vise screw manufacturer / supplier in china, offering 13 inch woodworking bench vise screw, deburring and beveling machine dm5a, deburring and beveling machine and so on..